Nonspreading lubricant



NUNSPREADING LUBRICANT Joseph S. Martin, .lr., Lancaster, Pa., assignor to Hamilton Watch Company, Lancaster, Pa.

No Drawing. Application March 1, 1954, Serial No. 413,474

1 Claim. ((1260-4105) This invention relates to a new composition of matter to be used as a lubricant for clocks, watches or other delicate instruments.

In the lubrication of fine instruments, such as clocks, watches and meters, one of the main problems is to retain the oil at the bearing, it being a tendency of the oil to spread over the metal and dissipate itself. As it is impossible to enclose these bearings to prevent the spread of the lubricant, an oil which has spread resistant properties is highly desirable.

It is the object of the present invention to provide an oil which is spread resistant and which, with this feature, retains other desirable qualities.

It is a still further object of the present invention to provide a lubricant made from the reaction product of caprylic acid and glycidyl phenyl ether.

It is a still further object of the present invention to provide a lubricant which will have a good viscosity, a pour point at -40 F. or below, which has resistance to spread, a low evaporation rate and a steel against sapphire coefiicient of friction in the neighborhood of .08.

The mono-ester reaction product of caprylic acid and glycidyl phenyl ether possesses the above qualifications. The preparation of this material is as follows:

States Patent 2,794,037 Patented May 28, 1957 "ice Kinematic viscosity F., centistokes--- 30 Pour point, F Minus 40 Refractive index 25 C 1.4935 Specific gravity 25/25 C 1.040 Resistance to spreading Good Evaporation rate Low Coefiicient of friction 0.080

What is claimed is:

A spread resistant lubricant, comprising alpha-phenyl, gamma-caprylate glycerol, characterized by having a pour point of 40 F., a coefficient of friction of .08, a good resistance to spread and a low evaporation rate.

References Cited in the file of this patent UNITED STATES PATENTS 2,191,039 Dickey Feb. 20, 1940 2,250,265 Kapp et a1. July 22, 1941 2,351,025 Marple June 13, 1944 2,534,611 Martin Dec. 19, 1950 2,559,171 Roach July 3, 1951 FOREIGN PATENTS 716,086 Great Britain Sept. 29, 1954 

